66481040 has 40 divisors (see below), whose sum is σ = 161293248. Its totient is φ = 25435520.

The previous prime is 66481039. The next prime is 66481043. The reversal of 66481040 is 4018466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 66480994 and 66481012.

It is not an unprimeable number, because it can be changed into a prime (66481043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16226 + ... + 19905.

Almost surely, 2^66481040 is an apocalyptic number.

It is an amenable number.

66481040 is an abundant number, since it is smaller than the sum of its proper divisors (94812208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66481040 is a wasteful number, since it uses less digits than its factorization.

66481040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36167 (or 36161 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 66481040 is about 8153.5906200888. The cubic root of 66481040 is about 405.1034435761.

The spelling of 66481040 in words is "sixty-six million, four hundred eighty-one thousand, forty".